Tightening device for driving belts



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E. o. EDI GENOVA TIGHTENING DEVICE FOR DRIVING BELTS Filed July 11.

Aug. 7, w23.

Patented Aug. 7, 1923.

narran stares EGIDIO OTTAVIO DI GENOVA, 0F 'ROM'.E, ITALY.

TIGHTENING DEVICE FOR DRIVING BELTS.

Application filed July 11, 1922.

Said machines have been greatly devel@ oped and are largely used in factories where they are driven by a main shaft with which they are connected with driving belts. lt happens however that said belts owing to the continuous tension to which they are subjected, in course of time, get slackened and lengthened, thus preventing a regular transmission of the movement. l

The workman in charge of the machine is therefore often compelled to stop the lmachine and effect the disconnection and the shortening of vthe driving belt and then to wind it again with great loss of time.

The tightening device according to my in-A vention has the object of preventing .this loss of time and allows to regulate in an easy manner and without loss of time the tension of the driving belt, without having to slip it ofi" and this by turning a key which shifts the tightening pulley wherecn the driving belt is guided. By causing the pulley to shift either towards or away from the belt, by turning the key in the one or the other direction, the tensiony of the belt is either increased or diminished, and this may be carried out without a breakage of the work.

1n the enclosed drawing showing a form of execution of the tightening device according to this invention:

Fig. 1 is a general schematical view of ay plant for the movement of two machines to which the device has been applied.

Figs.- 2, 3 and 4 show respectivelya front view, a side view and a diametral section of the device. Y

Figs. 5, 6 and 7 are transversal sections according to lines XX, YY, ZZ of Figs. 2, 3 and 4 respectively.

Fig. 8 shows the controlling key.

Serial 170,574,160.

for a certain portion 0f its length 6 and in this partis screwed a screw 7 whose upper end e is square or polygonal for receiving the key 9, Fig. 8, which is introduced through a hole 10 of the working plane and by means ef which the screw may be turned in order to lift or lower it.

The lower end of the screw stem 7 bears a revolving block 11 held between two washers 12 by a nut 13 and a splint-pin 14. The block 11 bears a radial extension 15 coming out from a, slot 16 provided in the lower part of the sleeve land bearing a pivot 17 on which is fitted loose the pulley 18 fastened t0 the pivot by means of a washer 19 pulley 18 is raised or lowered while the eX- tension 15 slides up or down guided in the slot 16.

in Fig. 1 is shown how matters are arranged when there is, for instance, a driving shaft 22 placed near the floor AA,be low the working plane 5 of two sets of sewing machines on the right and left side of the driving shaft itself.v

ri`he driving shaft bears a pulley 22 whereon are applied the driving belts 23 imparting motion to the pulleys 24-0f both machines, one stretch of the'belts 23 passing over, or under, the tightening pulley 18. From the shaft bearing the pulley 24 by means of a belt 25 the movement is transmitted to the pulley 26 of the work shaft.

it will be noticed how by lifting or lowering the pulleys 18 may be regulated the tension of the driving belts 23. Besides,

4according` to the way the vbelt 23 is laid on the pulley 18 the angle enveloped by the belts upon the pulleys 22, 24 may be increased or decreased as shown by the continuous and broken lines in Fig. 1.

Although in the drawing the device has been shown applied to the lower face of the working table, still it will be understood that, according to the dilferent positions which the driving shaft may have, it will be differentlyy placed, by modifying, when l port connected to the'plane,"a pulley car# red by the support, the supportbeng in the form of a sleeve, a central screw thread in the support, a screw received by the screw thread, a pivot carried bythe pulley, the

lower end of `the screw being connected to the pivot and the upper end of the screw being iormed to receive a key, andan aperture 1n the Work plane, for receiving a key;

2. A device according to claim l, said sup port having a slot on itsr lower end, said vscrew bearing a block having a radial eX- tension whereby to connect its screw to the said pivot, the radial extensions being slidable in the slot, 'to allow raising and lowering of the pulley by' means of the screw.

In testimony whereof I aHX my signature.

Lnenne orrlrvio nr GENOVA.

Witnesses: i

Lnrrnnn LABoUnT'rA, ANTONNE LAn'oUE'r'rA. 

